refridgerator compressor, wiring, function, air compressor

ninjaman

Joined May 18, 2013
338
hello,
i recently got a compressor from a fridge and want to use it as an air compressor for airbrushing. i can not seem to find any info on this particular compressor or wiring diagram. i did find some information about the wiring. i can get it working but it seems to operate funny. i attached line and neutral and it came on. then i unplugged it, plugged it back in an got an ground hum. it made a slight humming noise. i am not sure what this is. i unplugged it for a minute, plugged back in and it worked. it seems to do this. as though there is some charge in the capacitor. it has a relay, i believe. and a small round object which i think is a starting capacitor. i am not sure what is going on with it. any help or advice would be great. thanks
simon

Chris65536

Joined Nov 11, 2019
270
It might be a startup delay. After a fridge has been running, the high side pressure is very high. If you shut it off and attempt to restart right away, the compressor may not be strong enough to start up against that back pressure, and will just burn out. The delay makes sure the pressure drops enough before letting the motor restart.

shortbus

Joined Sep 30, 2009
8,581
i recently got a compressor from a fridge and want to use it as an air compressor for airbrushing.

shortbus

Joined Sep 30, 2009
8,581
Urethanes are especially sensitive to contaminants like oil.
That's why I asked him that in my first post. and it's not just urethanes most all automotive type paints will end up with "fish eyes" in the surface, since most refrigeration oils have silicone in them. Even with a real compressor setup stuff like Armor All and tire shine products used in a car can cause paint problems when repainting.

jpanhalt

Joined Jan 18, 2008
11,088
That's why I asked him that in my first post. and it's not just urethanes most all automotive type paints will end up with "fish eyes" in the surface, since most refrigeration oils have silicone in them. Even with a real compressor setup stuff like Armor All and tire shine products used in a car can cause paint problems when repainting.
I know from experience. No silicone, just ordinary contaminants. My first urethane job on a fiberglass model airplane looked horrible. Stripped and re-did it. I have had far fewer problems with catalysed DuPont Centari enamel, but I wonder whether it is still made.

shortbus

Joined Sep 30, 2009
8,581
They were still making it a few years ago but things change fast in the auto paint world.